Shaft holder for applying chucks



y 1931. R. L CARTER SHAFT I'iQLDER FQR APPLYING CHUCKS Filed Jan. 51., 1930 wax/4.

Patented May 12, 1931 RAY'L. CARTER, OF PHOEN'IX, 'NEW' YORK, ASSIGHGR TO THE STANLEY WORKS, OF NEW BRITAIN, COI-T'NECTICUT, A CCE-PORATION OF CONNECTICUT SHAFT HOLDER APPLYING CHECKS Application filed January 81, 1930.

This invention relates to means for holding motor shafts, and the like, from turning while chucks or other devices are being supplied to and removed therefrom, and has for its particular object to provide a novel reciprocating member, which may be permanently mounted upon an electric motor, of the type employed for routing, shaping, and similar machines, whereby the armature shaft may be temporarily locked and held from turning, when the driving current is shut ofl. A further object is to provide a holding member of this character which is mounted adjacent, and is arranged to shield, the free end of the motor shaft, while the latter is performing its normal work, the said member being provided with a socket adapted to receive a reduced portion of the shaft, when said member is moved manually in a plane at right angles to the axis of the motor, to prevent rotation of the shaft. A further object is to provide compression means for automatically releasing the locking member, to free the shaft. And a further object is to provide guiding and retaining means to control the reciprocable movements of said member, as well as to prevent accidental displacement of the same.

I attain these objects by the means set forth in the detailed description which follows, and as illustrated by the accompanying drawing, in which- Figure 1 is a top plan view of an electric motor, to which my improvement is applied, the latter being shown in full release. Fig. 2 is a side elevation of the motor, showing the shaft-locking member mounted upon its top end, also showing an ordinary tool chuck mounted upon the lower end of the armature shaft. Fig. 3 is a top end view of the motor stripped of the locking mechanism, showing the guide slots, also showing the reduced or flattened top end of the shaft. Fig. 4 is a top plan view of the holding member, in the release-d position, the shaft and the retaining screws being shown in horizontal section, taken on line 44 of Fig. 2. Fig. 5 is a similar view showing the holding member in the locking position. And Fig. 6 is an edge view of the holdin member.

In the rawing, 2 represents generally an and driving a tool, as 4.

Serial No. 425,019.

electric motor enclosed by a casing 2, the latterincluding top and bottom caps Qa-Zb, and the motor having an armature shaft 3, which preferably extends beyond the said cans. shown fitted with a chuck 4, for supporting v practice, chucks of this characterare usually threaded to the shafts, and when the chucks are removed, some means must be employed for I 2' holding the shafts stationary, to facilitate the unscrewing of the chucks. To accomplishthis according to the present showing, it provide an oblong flat metal member, as 5,

which is disposed diametrically across the top of the cap 52a, the latter being provided with spaced upright lugs 20, which are formed with coinciding slots 261, in which the holder his disposed and plays. Member 5 is formed with a substantially central circular opening 5, to loosely receive the top end of shaft 3 which may project a short distance above said member, as shown. The top end of the shaft is preferably flattened,

as at 3, in Figs. 1,3,4 and 5, to facilitate applying the member 5, or-a wrench, whenever it is desired to hold the shaft stationary, as explained. For this purpose, member 5 is formed with a longitudinal slot 5a, which intersects the hole 5", said slo't being of such size as to loosely receive the reduced portion -3 of the shaft, when said member ismoved in a plane at right angles to theaxis of the motor. The holder 5 is also formed with similar alining slots spaced equidistantly at the opposite sides of the shaft, in which screws'ti'play, said screws being threaded into the cap 2a adjacent the ways 2d. The slots '5'b5'0 are preferably the same length and determine the reciprocable movements of the members 5, as may be understood by consulting Fig. 1, and by comparing Figs. 4 and 5. Oneend of member 5 is preferably bent downwardly to provide a lip 501, which is engaged by one end of a compression spring T, t-he oppo'siteend ofsaid spring being .ne'sted'in 'a groove 250 of cap 2e, and engages'the clos'ed'endofsaid groove, as shown in Fig. 3. Spring 7 tends to hold member 5 in the released position,

The bottom end of the shaft 3 is 5b5c preferably shown in Figs. 1 and 4,the operating or looking position of said member being shown in Fig. 5, and by dotted lines in Fig. 1. To operate my holding device, the current is first shut off to stop the motor. In order to unscrew and remove the chuck l, the operator next places a thumb against the lip 50'. and pushes member 5 inwardly (or towards left) against the tension of spring 7. This disposes the flattened end 3 of the shaft in the slot 564, and prevents the shaft from turning. To release the shaft, the operator simply lets go the member 5, and the spring 7 instantly restores said member to its inoperative position, shown in Figs. 1

and 4E.

My shait't-holdin g device isextremelysimple, and affords an ever-ready, quick and positive means to lock the shaft 8 against rotation. The permanent attachment of the member 5 to the motor casing obviates the necessity of the operator wasting time hunting for a suitable wrench and adjusting the same to grip and hold the shaft, in order to enable him to apply and remove the chuclry Furthermore, member 5 acts as a shield and obviates all danger of injury to the operator by preventing his clothing from coming into contact with the mutilated end 3 of the shaft.

said member having a contracted slot that intersects said opening adapted to receive the flattened portion of the shaft when said member is moved manually in one directionlin saidv ways, to prevent rotation of the shaft, a spring to move'said member in the opposite direction to release the shaft from said slot to enable the shaft to rotate in said opening, and complementary means to prevent accidental detachment of said member from the casing.

In testimony whereof I affix my signature. I L. CARTER.

Having thus described my invention, what I claim, is-

1. The comblnation with an encased electrio motor including the armature shaft and tion of the opening being contracted to rea chuck threaded to one end thereof, the other end of the shaft having a reduced portion projecting beyond the corresponding end of the casing, of a holding member reciprocable in ways formed in said end of the casing having an elongated opening to receive the shaft, a portion of said opening being substantially the diameter of the shaft, an adjacent porceive the reduced portion of the shaft'when the member is moved manually in one direction, to prevent rotation thereof, and compression means to move the member in the opposite direction to free the shaft. I

2. An encased electric motor having in combination with the armature shaft one end thereof protruding beyond the casing, and said casing'being formed with alining guide grooves arranged diametrically, a holding member reciprocable in said grooves and be ingaperturedto receive the protruding end of the shaft, said aperture being elongated to enable said member to be moved at right angles to the axis of the motor to hold the shaft stationary, and compression means to move said member in the opposite direction to enablethe shaft to rotate.

3. An encased motor having in combination with its driving shaft having one end threaded, the other end of the shaft having a flattened portion, the portion of the casing 

